diff --git a/read-action-input b/read-action-input
index d12ee1c..67c71c2 100755
--- a/read-action-input
+++ b/read-action-input
@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 # helper script for printing kebab-cased env vars.
 # e.g., "foo-bar" -> "INPUT_FOO-BAR".
+set -eu -o pipefail 
 
 arg=INPUT_${1^^}
 while IFS= read -r -d '' var; do